1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/ioctl.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 */
7
8 #include <linux/syscalls.h>
9 #include <linux/mm.h>
10 #include <linux/capability.h>
11 #include <linux/file.h>
12 #include <linux/fs.h>
13 #include <linux/security.h>
14 #include <linux/export.h>
15 #include <linux/uaccess.h>
16 #include <linux/writeback.h>
17 #include <linux/buffer_head.h>
18 #include <linux/falloc.h>
19 #include <linux/sched/signal.h>
20
21 #include "internal.h"
22
23 #include <asm/ioctls.h>
24
25 /* So that the fiemap access checks can't overflow on 32 bit machines. */
26 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
27
28 /**
29 * vfs_ioctl - call filesystem specific ioctl methods
30 * @filp: open file to invoke ioctl method on
31 * @cmd: ioctl command to execute
32 * @arg: command-specific argument for ioctl
33 *
34 * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
35 * returns -ENOTTY.
36 *
37 * Returns 0 on success, -errno on error.
38 */
vfs_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)39 long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
40 {
41 int error = -ENOTTY;
42
43 if (!filp->f_op->unlocked_ioctl)
44 goto out;
45
46 error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
47 if (error == -ENOIOCTLCMD)
48 error = -ENOTTY;
49 out:
50 return error;
51 }
52 EXPORT_SYMBOL(vfs_ioctl);
53
ioctl_fibmap(struct file * filp,int __user * p)54 static int ioctl_fibmap(struct file *filp, int __user *p)
55 {
56 struct address_space *mapping = filp->f_mapping;
57 int res, block;
58
59 /* do we support this mess? */
60 if (!mapping->a_ops->bmap)
61 return -EINVAL;
62 if (!capable(CAP_SYS_RAWIO))
63 return -EPERM;
64 res = get_user(block, p);
65 if (res)
66 return res;
67 res = mapping->a_ops->bmap(mapping, block);
68 return put_user(res, p);
69 }
70
71 /**
72 * fiemap_fill_next_extent - Fiemap helper function
73 * @fieinfo: Fiemap context passed into ->fiemap
74 * @logical: Extent logical start offset, in bytes
75 * @phys: Extent physical start offset, in bytes
76 * @len: Extent length, in bytes
77 * @flags: FIEMAP_EXTENT flags that describe this extent
78 *
79 * Called from file system ->fiemap callback. Will populate extent
80 * info as passed in via arguments and copy to user memory. On
81 * success, extent count on fieinfo is incremented.
82 *
83 * Returns 0 on success, -errno on error, 1 if this was the last
84 * extent that will fit in user array.
85 */
86 #define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
87 #define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
88 #define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
fiemap_fill_next_extent(struct fiemap_extent_info * fieinfo,u64 logical,u64 phys,u64 len,u32 flags)89 int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
90 u64 phys, u64 len, u32 flags)
91 {
92 struct fiemap_extent extent;
93 struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
94
95 /* only count the extents */
96 if (fieinfo->fi_extents_max == 0) {
97 fieinfo->fi_extents_mapped++;
98 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
99 }
100
101 if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
102 return 1;
103
104 if (flags & SET_UNKNOWN_FLAGS)
105 flags |= FIEMAP_EXTENT_UNKNOWN;
106 if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
107 flags |= FIEMAP_EXTENT_ENCODED;
108 if (flags & SET_NOT_ALIGNED_FLAGS)
109 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
110
111 memset(&extent, 0, sizeof(extent));
112 extent.fe_logical = logical;
113 extent.fe_physical = phys;
114 extent.fe_length = len;
115 extent.fe_flags = flags;
116
117 dest += fieinfo->fi_extents_mapped;
118 if (copy_to_user(dest, &extent, sizeof(extent)))
119 return -EFAULT;
120
121 fieinfo->fi_extents_mapped++;
122 if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
123 return 1;
124 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
125 }
126 EXPORT_SYMBOL(fiemap_fill_next_extent);
127
128 /**
129 * fiemap_check_flags - check validity of requested flags for fiemap
130 * @fieinfo: Fiemap context passed into ->fiemap
131 * @fs_flags: Set of fiemap flags that the file system understands
132 *
133 * Called from file system ->fiemap callback. This will compute the
134 * intersection of valid fiemap flags and those that the fs supports. That
135 * value is then compared against the user supplied flags. In case of bad user
136 * flags, the invalid values will be written into the fieinfo structure, and
137 * -EBADR is returned, which tells ioctl_fiemap() to return those values to
138 * userspace. For this reason, a return code of -EBADR should be preserved.
139 *
140 * Returns 0 on success, -EBADR on bad flags.
141 */
fiemap_check_flags(struct fiemap_extent_info * fieinfo,u32 fs_flags)142 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
143 {
144 u32 incompat_flags;
145
146 incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
147 if (incompat_flags) {
148 fieinfo->fi_flags = incompat_flags;
149 return -EBADR;
150 }
151 return 0;
152 }
153 EXPORT_SYMBOL(fiemap_check_flags);
154
fiemap_check_ranges(struct super_block * sb,u64 start,u64 len,u64 * new_len)155 static int fiemap_check_ranges(struct super_block *sb,
156 u64 start, u64 len, u64 *new_len)
157 {
158 u64 maxbytes = (u64) sb->s_maxbytes;
159
160 *new_len = len;
161
162 if (len == 0)
163 return -EINVAL;
164
165 if (start > maxbytes)
166 return -EFBIG;
167
168 /*
169 * Shrink request scope to what the fs can actually handle.
170 */
171 if (len > maxbytes || (maxbytes - len) < start)
172 *new_len = maxbytes - start;
173
174 return 0;
175 }
176
ioctl_fiemap(struct file * filp,unsigned long arg)177 static int ioctl_fiemap(struct file *filp, unsigned long arg)
178 {
179 struct fiemap fiemap;
180 struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
181 struct fiemap_extent_info fieinfo = { 0, };
182 struct inode *inode = file_inode(filp);
183 struct super_block *sb = inode->i_sb;
184 u64 len;
185 int error;
186
187 if (!inode->i_op->fiemap)
188 return -EOPNOTSUPP;
189
190 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
191 return -EFAULT;
192
193 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
194 return -EINVAL;
195
196 error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
197 &len);
198 if (error)
199 return error;
200
201 fieinfo.fi_flags = fiemap.fm_flags;
202 fieinfo.fi_extents_max = fiemap.fm_extent_count;
203 fieinfo.fi_extents_start = ufiemap->fm_extents;
204
205 if (fiemap.fm_extent_count != 0 &&
206 !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
207 fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
208 return -EFAULT;
209
210 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
211 filemap_write_and_wait(inode->i_mapping);
212
213 error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
214 fiemap.fm_flags = fieinfo.fi_flags;
215 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
216 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
217 error = -EFAULT;
218
219 return error;
220 }
221
ioctl_file_clone(struct file * dst_file,unsigned long srcfd,u64 off,u64 olen,u64 destoff)222 static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
223 u64 off, u64 olen, u64 destoff)
224 {
225 struct fd src_file = fdget(srcfd);
226 int ret;
227
228 if (!src_file.file)
229 return -EBADF;
230 ret = -EXDEV;
231 if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
232 goto fdput;
233 ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
234 fdput:
235 fdput(src_file);
236 return ret;
237 }
238
ioctl_file_clone_range(struct file * file,void __user * argp)239 static long ioctl_file_clone_range(struct file *file, void __user *argp)
240 {
241 struct file_clone_range args;
242
243 if (copy_from_user(&args, argp, sizeof(args)))
244 return -EFAULT;
245 return ioctl_file_clone(file, args.src_fd, args.src_offset,
246 args.src_length, args.dest_offset);
247 }
248
249 #ifdef CONFIG_BLOCK
250
logical_to_blk(struct inode * inode,loff_t offset)251 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
252 {
253 return (offset >> inode->i_blkbits);
254 }
255
blk_to_logical(struct inode * inode,sector_t blk)256 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
257 {
258 return (blk << inode->i_blkbits);
259 }
260
261 /**
262 * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
263 * @inode: the inode to map
264 * @fieinfo: the fiemap info struct that will be passed back to userspace
265 * @start: where to start mapping in the inode
266 * @len: how much space to map
267 * @get_block: the fs's get_block function
268 *
269 * This does FIEMAP for block based inodes. Basically it will just loop
270 * through get_block until we hit the number of extents we want to map, or we
271 * go past the end of the file and hit a hole.
272 *
273 * If it is possible to have data blocks beyond a hole past @inode->i_size, then
274 * please do not use this function, it will stop at the first unmapped block
275 * beyond i_size.
276 *
277 * If you use this function directly, you need to do your own locking. Use
278 * generic_block_fiemap if you want the locking done for you.
279 */
280
__generic_block_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,loff_t start,loff_t len,get_block_t * get_block)281 int __generic_block_fiemap(struct inode *inode,
282 struct fiemap_extent_info *fieinfo, loff_t start,
283 loff_t len, get_block_t *get_block)
284 {
285 struct buffer_head map_bh;
286 sector_t start_blk, last_blk;
287 loff_t isize = i_size_read(inode);
288 u64 logical = 0, phys = 0, size = 0;
289 u32 flags = FIEMAP_EXTENT_MERGED;
290 bool past_eof = false, whole_file = false;
291 int ret = 0;
292
293 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
294 if (ret)
295 return ret;
296
297 /*
298 * Either the i_mutex or other appropriate locking needs to be held
299 * since we expect isize to not change at all through the duration of
300 * this call.
301 */
302 if (len >= isize) {
303 whole_file = true;
304 len = isize;
305 }
306
307 /*
308 * Some filesystems can't deal with being asked to map less than
309 * blocksize, so make sure our len is at least block length.
310 */
311 if (logical_to_blk(inode, len) == 0)
312 len = blk_to_logical(inode, 1);
313
314 start_blk = logical_to_blk(inode, start);
315 last_blk = logical_to_blk(inode, start + len - 1);
316
317 do {
318 /*
319 * we set b_size to the total size we want so it will map as
320 * many contiguous blocks as possible at once
321 */
322 memset(&map_bh, 0, sizeof(struct buffer_head));
323 map_bh.b_size = len;
324
325 ret = get_block(inode, start_blk, &map_bh, 0);
326 if (ret)
327 break;
328
329 /* HOLE */
330 if (!buffer_mapped(&map_bh)) {
331 start_blk++;
332
333 /*
334 * We want to handle the case where there is an
335 * allocated block at the front of the file, and then
336 * nothing but holes up to the end of the file properly,
337 * to make sure that extent at the front gets properly
338 * marked with FIEMAP_EXTENT_LAST
339 */
340 if (!past_eof &&
341 blk_to_logical(inode, start_blk) >= isize)
342 past_eof = 1;
343
344 /*
345 * First hole after going past the EOF, this is our
346 * last extent
347 */
348 if (past_eof && size) {
349 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
350 ret = fiemap_fill_next_extent(fieinfo, logical,
351 phys, size,
352 flags);
353 } else if (size) {
354 ret = fiemap_fill_next_extent(fieinfo, logical,
355 phys, size, flags);
356 size = 0;
357 }
358
359 /* if we have holes up to/past EOF then we're done */
360 if (start_blk > last_blk || past_eof || ret)
361 break;
362 } else {
363 /*
364 * We have gone over the length of what we wanted to
365 * map, and it wasn't the entire file, so add the extent
366 * we got last time and exit.
367 *
368 * This is for the case where say we want to map all the
369 * way up to the second to the last block in a file, but
370 * the last block is a hole, making the second to last
371 * block FIEMAP_EXTENT_LAST. In this case we want to
372 * see if there is a hole after the second to last block
373 * so we can mark it properly. If we found data after
374 * we exceeded the length we were requesting, then we
375 * are good to go, just add the extent to the fieinfo
376 * and break
377 */
378 if (start_blk > last_blk && !whole_file) {
379 ret = fiemap_fill_next_extent(fieinfo, logical,
380 phys, size,
381 flags);
382 break;
383 }
384
385 /*
386 * if size != 0 then we know we already have an extent
387 * to add, so add it.
388 */
389 if (size) {
390 ret = fiemap_fill_next_extent(fieinfo, logical,
391 phys, size,
392 flags);
393 if (ret)
394 break;
395 }
396
397 logical = blk_to_logical(inode, start_blk);
398 phys = blk_to_logical(inode, map_bh.b_blocknr);
399 size = map_bh.b_size;
400 flags = FIEMAP_EXTENT_MERGED;
401
402 start_blk += logical_to_blk(inode, size);
403
404 /*
405 * If we are past the EOF, then we need to make sure as
406 * soon as we find a hole that the last extent we found
407 * is marked with FIEMAP_EXTENT_LAST
408 */
409 if (!past_eof && logical + size >= isize)
410 past_eof = true;
411 }
412 cond_resched();
413 if (fatal_signal_pending(current)) {
414 ret = -EINTR;
415 break;
416 }
417
418 } while (1);
419
420 /* If ret is 1 then we just hit the end of the extent array */
421 if (ret == 1)
422 ret = 0;
423
424 return ret;
425 }
426 EXPORT_SYMBOL(__generic_block_fiemap);
427
428 /**
429 * generic_block_fiemap - FIEMAP for block based inodes
430 * @inode: The inode to map
431 * @fieinfo: The mapping information
432 * @start: The initial block to map
433 * @len: The length of the extect to attempt to map
434 * @get_block: The block mapping function for the fs
435 *
436 * Calls __generic_block_fiemap to map the inode, after taking
437 * the inode's mutex lock.
438 */
439
generic_block_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 len,get_block_t * get_block)440 int generic_block_fiemap(struct inode *inode,
441 struct fiemap_extent_info *fieinfo, u64 start,
442 u64 len, get_block_t *get_block)
443 {
444 int ret;
445 inode_lock(inode);
446 ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
447 inode_unlock(inode);
448 return ret;
449 }
450 EXPORT_SYMBOL(generic_block_fiemap);
451
452 #endif /* CONFIG_BLOCK */
453
454 /*
455 * This provides compatibility with legacy XFS pre-allocation ioctls
456 * which predate the fallocate syscall.
457 *
458 * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
459 * are used here, rest are ignored.
460 */
ioctl_preallocate(struct file * filp,void __user * argp)461 int ioctl_preallocate(struct file *filp, void __user *argp)
462 {
463 struct inode *inode = file_inode(filp);
464 struct space_resv sr;
465
466 if (copy_from_user(&sr, argp, sizeof(sr)))
467 return -EFAULT;
468
469 switch (sr.l_whence) {
470 case SEEK_SET:
471 break;
472 case SEEK_CUR:
473 sr.l_start += filp->f_pos;
474 break;
475 case SEEK_END:
476 sr.l_start += i_size_read(inode);
477 break;
478 default:
479 return -EINVAL;
480 }
481
482 return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
483 }
484
file_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)485 static int file_ioctl(struct file *filp, unsigned int cmd,
486 unsigned long arg)
487 {
488 struct inode *inode = file_inode(filp);
489 int __user *p = (int __user *)arg;
490
491 switch (cmd) {
492 case FIBMAP:
493 return ioctl_fibmap(filp, p);
494 case FIONREAD:
495 return put_user(i_size_read(inode) - filp->f_pos, p);
496 case FS_IOC_RESVSP:
497 case FS_IOC_RESVSP64:
498 return ioctl_preallocate(filp, p);
499 }
500
501 return vfs_ioctl(filp, cmd, arg);
502 }
503
ioctl_fionbio(struct file * filp,int __user * argp)504 static int ioctl_fionbio(struct file *filp, int __user *argp)
505 {
506 unsigned int flag;
507 int on, error;
508
509 error = get_user(on, argp);
510 if (error)
511 return error;
512 flag = O_NONBLOCK;
513 #ifdef __sparc__
514 /* SunOS compatibility item. */
515 if (O_NONBLOCK != O_NDELAY)
516 flag |= O_NDELAY;
517 #endif
518 spin_lock(&filp->f_lock);
519 if (on)
520 filp->f_flags |= flag;
521 else
522 filp->f_flags &= ~flag;
523 spin_unlock(&filp->f_lock);
524 return error;
525 }
526
ioctl_fioasync(unsigned int fd,struct file * filp,int __user * argp)527 static int ioctl_fioasync(unsigned int fd, struct file *filp,
528 int __user *argp)
529 {
530 unsigned int flag;
531 int on, error;
532
533 error = get_user(on, argp);
534 if (error)
535 return error;
536 flag = on ? FASYNC : 0;
537
538 /* Did FASYNC state change ? */
539 if ((flag ^ filp->f_flags) & FASYNC) {
540 if (filp->f_op->fasync)
541 /* fasync() adjusts filp->f_flags */
542 error = filp->f_op->fasync(fd, filp, on);
543 else
544 error = -ENOTTY;
545 }
546 return error < 0 ? error : 0;
547 }
548
ioctl_fsfreeze(struct file * filp)549 static int ioctl_fsfreeze(struct file *filp)
550 {
551 struct super_block *sb = file_inode(filp)->i_sb;
552
553 if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
554 return -EPERM;
555
556 /* If filesystem doesn't support freeze feature, return. */
557 if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
558 return -EOPNOTSUPP;
559
560 /* Freeze */
561 if (sb->s_op->freeze_super)
562 return sb->s_op->freeze_super(sb);
563 return freeze_super(sb);
564 }
565
ioctl_fsthaw(struct file * filp)566 static int ioctl_fsthaw(struct file *filp)
567 {
568 struct super_block *sb = file_inode(filp)->i_sb;
569
570 if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
571 return -EPERM;
572
573 /* Thaw */
574 if (sb->s_op->thaw_super)
575 return sb->s_op->thaw_super(sb);
576 return thaw_super(sb);
577 }
578
ioctl_file_dedupe_range(struct file * file,void __user * arg)579 static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
580 {
581 struct file_dedupe_range __user *argp = arg;
582 struct file_dedupe_range *same = NULL;
583 int ret;
584 unsigned long size;
585 u16 count;
586
587 if (get_user(count, &argp->dest_count)) {
588 ret = -EFAULT;
589 goto out;
590 }
591
592 size = offsetof(struct file_dedupe_range __user, info[count]);
593 if (size > PAGE_SIZE) {
594 ret = -ENOMEM;
595 goto out;
596 }
597
598 same = memdup_user(argp, size);
599 if (IS_ERR(same)) {
600 ret = PTR_ERR(same);
601 same = NULL;
602 goto out;
603 }
604
605 same->dest_count = count;
606 ret = vfs_dedupe_file_range(file, same);
607 if (ret)
608 goto out;
609
610 ret = copy_to_user(argp, same, size);
611 if (ret)
612 ret = -EFAULT;
613
614 out:
615 kfree(same);
616 return ret;
617 }
618
619 /*
620 * When you add any new common ioctls to the switches above and below
621 * please update compat_sys_ioctl() too.
622 *
623 * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
624 * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
625 */
do_vfs_ioctl(struct file * filp,unsigned int fd,unsigned int cmd,unsigned long arg)626 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
627 unsigned long arg)
628 {
629 int error = 0;
630 int __user *argp = (int __user *)arg;
631 struct inode *inode = file_inode(filp);
632
633 switch (cmd) {
634 case FIOCLEX:
635 set_close_on_exec(fd, 1);
636 break;
637
638 case FIONCLEX:
639 set_close_on_exec(fd, 0);
640 break;
641
642 case FIONBIO:
643 error = ioctl_fionbio(filp, argp);
644 break;
645
646 case FIOASYNC:
647 error = ioctl_fioasync(fd, filp, argp);
648 break;
649
650 case FIOQSIZE:
651 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
652 S_ISLNK(inode->i_mode)) {
653 loff_t res = inode_get_bytes(inode);
654 error = copy_to_user(argp, &res, sizeof(res)) ?
655 -EFAULT : 0;
656 } else
657 error = -ENOTTY;
658 break;
659
660 case FIFREEZE:
661 error = ioctl_fsfreeze(filp);
662 break;
663
664 case FITHAW:
665 error = ioctl_fsthaw(filp);
666 break;
667
668 case FS_IOC_FIEMAP:
669 return ioctl_fiemap(filp, arg);
670
671 case FIGETBSZ:
672 return put_user(inode->i_sb->s_blocksize, argp);
673
674 case FICLONE:
675 return ioctl_file_clone(filp, arg, 0, 0, 0);
676
677 case FICLONERANGE:
678 return ioctl_file_clone_range(filp, argp);
679
680 case FIDEDUPERANGE:
681 return ioctl_file_dedupe_range(filp, argp);
682
683 default:
684 if (S_ISREG(inode->i_mode))
685 error = file_ioctl(filp, cmd, arg);
686 else
687 error = vfs_ioctl(filp, cmd, arg);
688 break;
689 }
690 return error;
691 }
692
ksys_ioctl(unsigned int fd,unsigned int cmd,unsigned long arg)693 int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
694 {
695 int error;
696 struct fd f = fdget(fd);
697
698 if (!f.file)
699 return -EBADF;
700 error = security_file_ioctl(f.file, cmd, arg);
701 if (!error)
702 error = do_vfs_ioctl(f.file, fd, cmd, arg);
703 fdput(f);
704 return error;
705 }
706
SYSCALL_DEFINE3(ioctl,unsigned int,fd,unsigned int,cmd,unsigned long,arg)707 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
708 {
709 return ksys_ioctl(fd, cmd, arg);
710 }
711
